package sybh.sww.jdbc;

import java.sql.*;
import java.util.Scanner;

public class Login {
    public static void main(String[] args)throws Exception{
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入账号：");
        String username = scanner.nextLine();
        System.out.println("请输入密码：");
        String password = scanner.nextLine();

        loginPlus(username,password);
    }

    public static void login (String n,String p)throws Exception{
        System.out.println("username="+n);
        System.out.println("password="+p);
        String sql = "SELECT id FROM `user` WHERE username = '"
                + n +
                "' AND `password`=MD5(" +p+
                ");";
        System.out.println("组成的SQl语句是："+sql);

        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
        String username = "root";
        String password = "root";
        Connection connection = DriverManager.getConnection(url, username, password);
        Statement statement = connection.createStatement();
        ResultSet set = statement.executeQuery(sql);
        if(set.next()){
            System.out.println("登录成功！");
        }else {
            System.out.println("登录失败！");
        }

    }
    public static void loginPlus (String n,String p)throws Exception{
        System.out.println("username="+n);
        System.out.println("password="+p);
        String sql ="SELECT id FROM `user` WHERE username = ? AND `password`=MD5(?);";

        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
        String username = "root";
        String password = "root";
        Connection connection = DriverManager.getConnection(url, username, password);

        PreparedStatement ps = connection.prepareStatement(sql);
        ps.setString(1,n);
        ps.setString(2,p);
        ResultSet set = ps.executeQuery();
        if(set.next()){
            System.out.println("登录成功！");
        }else {
            System.out.println("登录失败！");
        }

    }
}
